Liabilities - Convertible Senior Notes Carrying Value (Details) - USD ($) $ in Thousands	Sep. 30, 2023	May 19, 2023	Dec. 31, 2022	Nov. 17, 2020	May 18, 2020	Jan. 10, 2017
Debt
Principal amount	$ 281,500		$ 277,673
Unamortized debt discount/transaction costs	(6,854)		(3,013)
Net carrying value	274,646		274,660
2023 Notes
Debt
Principal amount			20,173			$ 345,000
Unamortized debt discount/transaction costs			(4)
Net carrying value			20,169
2025 Notes
Debt
Principal amount	26,500		132,500	$ 132,500
Unamortized debt discount/transaction costs	(124)		(990)
Net carrying value	26,376		131,510
2027 Notes
Debt
Principal amount	25,000		125,000		$ 125,000
Unamortized debt discount/transaction costs	(336)		(2,019)
Net carrying value	24,664		$ 122,981
2029 Notes
Debt
Principal amount	230,000	$ 230,000
Unamortized debt discount/transaction costs	(6,394)
Net carrying value	$ 223,606